To suppress a slab defect of blow holes in a method for casting a Cr-containing steel such as a stainless steel to form into the stock for a seamless steel pipe.
In the method, a steel having a composition comprising, by mass, ≤0.04% C, 0.10 to 1.00% Si, 0.1 to 1.5% Mn, 20.0 to 30.0% Cr, 5.0 to 11.0% Ni, 0.5 to 6.0% Mo, 0.001 to 0.05% Al and 0.2 to 0.5% N, and the balance Fe with impurities wherein the content of S is ≤0.010% and the content of P is ≤0.030% is cast. The casting is performed under the conditions where, provided that the content (mass%) of diffusible hydrogen, the content (mass%) of nitrogen and the content (mass%) of Cr in the steel are defined as [%H], [%N] and [%Cr], and the cross-sectional area (m
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